Here's an example for configuring your openings hours and setting them up for events with special menus depending on the time of day
Open 7 days a week, 24 hours a day
Open Monday to Friday, from 11am to 10pm
Open Monday to Friday, from 11am to 3pm, and 6pm to 10pm
If you have different menus for breakfast, and rest of the day - you should create two sets of opening hours.
Events and their opening hours are used for special occasions, with different opening (or closing hours).
See below an example the restaurant is closed for New Year's Eve with only Food available